websocket-lwt-unix: not compatible with recent conduit
This is transitively used from cohttp-lwt-unix. Error:
```
#=== ERROR while compiling websocket-lwt-unix.2.14 ============================#
# context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.4.14.1 | file:///home/opam/opam-repository
# path ~/.opam/4.14/.opam-switch/build/websocket-lwt-unix.2.14
# command ~/.opam/opam-init/hooks/sandbox.sh build dune build -j 255 -p websocket-lwt-unix
# exit-code 1
# env-file ~/.opam/log/websocket-lwt-unix-7-f908e5.env
# output-file ~/.opam/log/websocket-lwt-unix-7-f908e5.out
### output ###
# (cd _build/default && /home/opam/.opam/4.14/bin/ocamlopt.opt -w -40 -g -I lwt/.websocket_lwt_unix.objs/byte -I lwt/.websocket_lwt_unix.objs/native -I /home/opam/.opam/4.14/lib/angstrom -I /home/opam/.opam/4.14/lib/astring -I /home/opam/.opam/4.14/lib/base/caml -I /home/opam/.opam/4.14/lib/base64 -I /home/opam/.opam/4.14/lib/bigstringaf -I /home/opam/.opam/4.14/lib/cohttp -I /home/opam/.opam/4.14/lib/cohttp-lwt -I /home/opam/.opam/4.14/lib/cohttp-lwt-unix -I /home/opam/.opam/4.14/lib/conduit -I /home/opam/.opam/4.14/lib/conduit-lwt -I /home/opam/.opam/4.14/lib/conduit-lwt-unix -I /home/opam/.opam/4.14/lib/domain-name -I /home/opam/.opam/4.14/lib/fmt -I /home/opam/.opam/4.14/lib/ipaddr -I /home/opam/.opam/4.14/lib/ipaddr-sexp -I /home/opam/.opam/4.14/lib/ipaddr/unix -I /home/opam/.opam/4.14/lib/logs -I /home/opam/.opam/4.14/lib/lwt -I /home/opam/.opam/4.14/lib/lwt/unix -I /home/opam/.opam/4.14/lib/lwt_log -I /home/opam/.opam/4.14/lib/lwt_log/core -I /home/opam/.opam/4.14/lib/macaddr -I /home/opam/.opam/4.14/lib/magic-mime -I /home/opam/.opam/4.14/lib/ocaml/threads -I /home/opam/.opam/4.14/lib/ocplib-endian -I /home/opam/.opam/4.14/lib/ocplib-endian/bigstring -I /home/opam/.opam/4.14/lib/parsexp -I /home/opam/.opam/4.14/lib/ppx_sexp_conv/runtime-lib -I /home/opam/.opam/4.14/lib/re -I /home/opam/.opam/4.14/lib/seq -I /home/opam/.opam/4.14/lib/sexplib -I /home/opam/.opam/4.14/lib/sexplib0 -I /home/opam/.opam/4.14/lib/stringext -I /home/opam/.opam/4.14/lib/uri -I /home/opam/.opam/4.14/lib/uri-sexp -I /home/opam/.opam/4.14/lib/uri/services -I /home/opam/.opam/4.14/lib/websocket -intf-suffix .ml -no-alias-deps -o lwt/.websocket_lwt_unix.objs/native/websocket_lwt_unix.cmx -c -impl lwt/websocket_lwt_unix.ml)
# File "lwt/websocket_lwt_unix.ml", line 54, characters 30-33:
# 54 | Conduit_lwt_unix.connect ~ctx client >>= fun (flow, ic, oc) ->
# ^^^
# Error: This expression has type
# Conduit_lwt_unix.ctx Lazy.t = Conduit_lwt_unix.ctx lazy_t
# but an expression was expected of type Conduit_lwt_unix.ctx
# (cd _build/default && /home/opam/.opam/4.14/bin/ocamlc.opt -w -40 -g -bin-annot -I lwt/.wscat.eobjs/byte -I /home/opam/.opam/4.14/lib/angstrom -I /home/opam/.opam/4.14/lib/astring -I /home/opam/.opam/4.14/lib/base/caml -I /home/opam/.opam/4.14/lib/base64 -I /home/opam/.opam/4.14/lib/bigstringaf -I /home/opam/.opam/4.14/lib/cohttp -I /home/opam/.opam/4.14/lib/cohttp-lwt -I /home/opam/.opam/4.14/lib/cohttp-lwt-unix -I /home/opam/.opam/4.14/lib/conduit -I /home/opam/.opam/4.14/lib/conduit-lwt -I /home/opam/.opam/4.14/lib/conduit-lwt-unix -I /home/opam/.opam/4.14/lib/domain-name -I /home/opam/.opam/4.14/lib/fmt -I /home/opam/.opam/4.14/lib/ipaddr -I /home/opam/.opam/4.14/lib/ipaddr-sexp -I /home/opam/.opam/4.14/lib/ipaddr/unix -I /home/opam/.opam/4.14/lib/logs -I /home/opam/.opam/4.14/lib/lwt -I /home/opam/.opam/4.14/lib/lwt/unix -I /home/opam/.opam/4.14/lib/lwt_log -I /home/opam/.opam/4.14/lib/lwt_log/core -I /home/opam/.opam/4.14/lib/macaddr -I /home/opam/.opam/4.14/lib/magic-mime -I /home/opam/.opam/4.14/lib/ocaml/threads -I /home/opam/.opam/4.14/lib/ocplib-endian -I /home/opam/.opam/4.14/lib/ocplib-endian/bigstring -I /home/opam/.opam/4.14/lib/parsexp -I /home/opam/.opam/4.14/lib/ppx_sexp_conv/runtime-lib -I /home/opam/.opam/4.14/lib/re -I /home/opam/.opam/4.14/lib/seq -I /home/opam/.opam/4.14/lib/sexplib -I /home/opam/.opam/4.14/lib/sexplib0 -I /home/opam/.opam/4.14/lib/stringext -I /home/opam/.opam/4.14/lib/uri -I /home/opam/.opam/4.14/lib/uri-sexp -I /home/opam/.opam/4.14/lib/uri/services -I /home/opam/.opam/4.14/lib/websocket -I lwt/.websocket_lwt_unix.objs/byte -no-alias-deps -o lwt/.wscat.eobjs/byte/wscat.cmo -c -impl lwt/wscat.ml)
# File "lwt/wscat.ml", line 10, characters 40-51:
# 10 | Conduit_lwt_unix.(endp_to_client ~ctx:default_ctx endp >>= fun client ->
# ^^^^^^^^^^^
# Error: This expression has type
# Conduit_lwt_unix.ctx Lazy.t = Conduit_lwt_unix.ctx lazy_t
# but an expression was expected of type Conduit_lwt_unix.ctx
# (cd _build/default && /home/opam/.opam/4.14/bin/ocamlc.opt -w -40 -g -bin-annot -I lwt/.websocket_lwt_unix.objs/byte -I /home/opam/.opam/4.14/lib/angstrom -I /home/opam/.opam/4.14/lib/astring -I /home/opam/.opam/4.14/lib/base/caml -I /home/opam/.opam/4.14/lib/base64 -I /home/opam/.opam/4.14/lib/bigstringaf -I /home/opam/.opam/4.14/lib/cohttp -I /home/opam/.opam/4.14/lib/cohttp-lwt -I /home/opam/.opam/4.14/lib/cohttp-lwt-unix -I /home/opam/.opam/4.14/lib/conduit -I /home/opam/.opam/4.14/lib/conduit-lwt -I /home/opam/.opam/4.14/lib/conduit-lwt-unix -I /home/opam/.opam/4.14/lib/domain-name -I /home/opam/.opam/4.14/lib/fmt -I /home/opam/.opam/4.14/lib/ipaddr -I /home/opam/.opam/4.14/lib/ipaddr-sexp -I /home/opam/.opam/4.14/lib/ipaddr/unix -I /home/opam/.opam/4.14/lib/logs -I /home/opam/.opam/4.14/lib/lwt -I /home/opam/.opam/4.14/lib/lwt/unix -I /home/opam/.opam/4.14/lib/lwt_log -I /home/opam/.opam/4.14/lib/lwt_log/core -I /home/opam/.opam/4.14/lib/macaddr -I /home/opam/.opam/4.14/lib/magic-mime -I /home/opam/.opam/4.14/lib/ocaml/threads -I /home/opam/.opam/4.14/lib/ocplib-endian -I /home/opam/.opam/4.14/lib/ocplib-endian/bigstring -I /home/opam/.opam/4.14/lib/parsexp -I /home/opam/.opam/4.14/lib/ppx_sexp_conv/runtime-lib -I /home/opam/.opam/4.14/lib/re -I /home/opam/.opam/4.14/lib/seq -I /home/opam/.opam/4.14/lib/sexplib -I /home/opam/.opam/4.14/lib/sexplib0 -I /home/opam/.opam/4.14/lib/stringext -I /home/opam/.opam/4.14/lib/uri -I /home/opam/.opam/4.14/lib/uri-sexp -I /home/opam/.opam/4.14/lib/uri/services -I /home/opam/.opam/4.14/lib/websocket -intf-suffix .ml -no-alias-deps -o lwt/.websocket_lwt_unix.objs/byte/websocket_lwt_unix.cmo -c -impl lwt/websocket_lwt_unix.ml)
# File "lwt/websocket_lwt_unix.ml", line 54, characters 30-33:
# 54 | Conduit_lwt_unix.connect ~ctx client >>= fun (flow, ic, oc) ->
# ^^^
# Error: This expression has type
# Conduit_lwt_unix.ctx Lazy.t = Conduit_lwt_unix.ctx lazy_t
# but an expression was expected of type Conduit_lwt_unix.ctx
```
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